Study Of Stratum Displacement And Earth Pressure Considering Construction Program Of Shield Tunnel

Based on the current studying situation of the stratum displacement caused by shield tunneling and the interaction of soil and lining of tunnel, the thesis has discussed the shield tunneling process, which has significantly influenced the stratum displacement and earth pressure. Through the shield tunneling, grouting is the most important factor, which affects the magnitude and distribution of stratum displacement and ground-stress on lining. Therefore the thesis simulates the property of grouting layer, which varies with time.The thesis provides the concept of variable rigid body which simulates the grouting, and simulates the process of shield tunneling with finite element method (FEM). The thesis has analyzed the magnitude and distribution of stratum displacement and earth pressure, with the background of the shield tunneling of Fuming to Jingtian in Shenzhen city. The different methods of simulating the grouting layer in current has been introduced, and the results of those methods has been compared, which indicates the method of variable rigid body simulating the grouting is close to the measured result well.The thesis analyses the influenced factors on the stratum displacement and earth pressure, for example, the thickness of grouting layer, soil property, stiffness of linings, the relative depth of burial, and so on. The results reveal the laws that stratum displacement and the distribution of earth pressure vary with those factors. Those results may have some reference value to the construction of shield tunnel.